From: dblack@...
Date: 2007-08-26T20:59:38+09:00
Subject: Re: Finding one certain line in a file is easy but how to look for headlines and something just under this certain headline?

Hi --

On Sun, 26 Aug 2007, kazaam wrote:

> Hi,
> I'm writing a little script for installing ati-drivers on linux
> machines but I have a little problem. I need to change the
> /etc/X11/xorg.conf file for this. This file is built like this (just
> a cut-out):
>
> Section "InputDevice"
>
> Now I need to change the driver value within the Section "Device"
> from ati|vesa|radeon|nomatterwhat... to fglrx, but how to find it?
> E.g. IO.foreach('/etc/X11/xorg.conf')  { |line| puts line if line =~
> /^Section "Device"/ } finds me the correct section but how to
> "navigate" now in it? Is iteration at all the answer to this
> problem?

I usually do something like this (where fh is my filehandle):

   while line = fh.gets
     flag = true if /Section "Device"/.match(line)
     flag = false if flag && line.gsub!(/(Driver\s+)"(.*)"/, '\1"fglrx"')
     puts line
   end


David

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